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HBASE-15640 L1 cache doesn't give fair warning that it is showing partial stats only when it hits limit

This commit is contained in:
stack 2016-04-20 14:19:12 -07:00
parent a331a57ef8
commit 71c55d182d
3 changed files with 26 additions and 9 deletions
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6
hbase-server/src/main/jamon/org/apache/hadoop/hbase/tmpl/regionserver/BlockCacheTmpl.jamon
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@ -305,7 +305,11 @@ are combined counts. Request count is sum of hits and misses.</p>
}
</%java>
<%if cbsbf.isFull() %>
<p><b>Statistics below is based on sampling first <% cbsbfSnapshot.getMax() %> blocks only</b> (hbase.ui.blockcache.by.file.max)</p>
<p>
<div class="alert alert-danger">
<strong>The stats below are incomplete!</strong> We ran into our accounting limit of <% cbsbf.getCount() %> blocks. Up the configuration <i>hbase.ui.blockcache.by.file.max</i>.
</div>
</p>
</%if>
<table id="blocks_summary" class="table table-striped">
<tr>

12
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockCacheUtil.java
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@ -179,16 +179,22 @@ public class BlockCacheUtil {
private long size;
private long dataSize;
private final long now = System.nanoTime();
/**
* How many blocks to look at before we give up.
* There could be many millions of blocks. We don't want the
* ui to freeze while we run through 1B blocks... users will
* think hbase dead. UI displays warning in red when stats
* are incomplete.
*/
private final int max;
public static final int DEFAULT_MAX = 100000;
public static final int DEFAULT_MAX = 1000000;
CachedBlocksByFile() {
this(null);
}
CachedBlocksByFile(final Configuration c) {
this.max = c == null? DEFAULT_MAX:
c.getInt("hbase.ui.blockcache.by.file.max", DEFAULT_MAX);
this.max = c == null? DEFAULT_MAX: c.getInt("hbase.ui.blockcache.by.file.max", DEFAULT_MAX);
}
/**

13
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java
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@ -195,7 +195,7 @@ public class HFileReaderV2 extends AbstractHFileReader {
end = getTrailer().getLoadOnOpenDataOffset();
HFileBlock prevBlock = null;
if (LOG.isTraceEnabled()) {
LOG.trace("Prefetch=" + path.toString() + ", offset=" + offset + ", end=" + end);
LOG.trace("Prefetch start " + getPathOffsetEndStr(path, offset, end));
}
while (offset < end) {
if (Thread.interrupted()) {
@ -213,11 +213,14 @@ public class HFileReaderV2 extends AbstractHFileReader {
} catch (IOException e) {
// IOExceptions are probably due to region closes (relocation, etc.)
if (LOG.isTraceEnabled()) {
LOG.trace("Prefetch=" + path.toString() + ", offset=" + offset + ", end=" + end, e);
LOG.trace("Prefetch " + getPathOffsetEndStr(path, offset, end), e);
}
} catch (NullPointerException e) {
LOG.warn("Stream moved/closed or prefetch cancelled?" +
getPathOffsetEndStr(path, offset, end), e);
} catch (Exception e) {
// Other exceptions are interesting
LOG.warn("Prefetch=" + path.toString() + ", offset=" + offset + ", end=" + end, e);
LOG.warn("Prefetch " + getPathOffsetEndStr(path, offset, end), e);
} finally {
PrefetchExecutor.complete(path);
}
@ -235,6 +238,10 @@ public class HFileReaderV2 extends AbstractHFileReader {
.build();
}
private static String getPathOffsetEndStr(final Path path, final long offset, final long end) {
return "path=" + path.toString() + ", offset=" + offset + ", end=" + end;
}
/**
* Create a Scanner on this file. No seeks or reads are done on creation. Call
* {@link HFileScanner#seekTo(byte[])} to position an start the read. There is